Hydrazine Gas Generator System 



This vehicle would share some of the subsystems of the pressurized 

 helium vehicle, namely, the personnel sphere, the propulsion system, frame, 

 and lifting gear. 



The generator will use hydrazine with 5% ammonia and will produce 

 0.132 ft^ of noncondensable gas per pound of fuel. The generator will be 

 similar to the one described in the Naval Ordnance Test Station (NOTS) 

 report entitled, "Emergency Deballasting of Submersibles Using Liquid Gas 

 Generator Systems."^ ° At an operating pressure of 2,670 psia, the generator 

 will have to displace about 690 ft^ of water from the ballast tanks. Thus, 

 each ballast tank, if 4 feet in diameter, will have a length including 

 hemispherical end caps of 26.1 feet. Its weight will be 3,283 pounds dry 

 and 2,850 pounds submerged. If 0.1 32 ft^ of gas per pound of fuel is 

 produced, then 690/0.132 = 5,230 lb of fuel will be required. Fuel density 

 is 61.9 lb/ft''. A 12 hp pump will be used for pumping the hydrazine from 

 the fuel bay into the reactant chamber. Since the deballasting rate is 

 100 lb/sec, approximately 7 minutes will be required to complete the job 

 of expelling the 690 ft^ of water from the lift tanks. The pump will require 

 an estimated (1 .04) kw-hr of electric energy based on the following: 



12hp X 0.746 kw/hp x 7/60 = 1.04 kw-hr 



This additional power requirement is negligible compared with the 224 kw-hr 

 needed for propulsion and lighting. 



Submerged Weight of Vehicle Subsystems 



a. Personnel Capsule -1-1,810 lb 



b. Gas Generator (est) - 2,000 lb 

 including wt of fuel bags 



c. Hydrazine Fuel -1-177 lb 



d. Ballast Tanks -2,850 1b 



e. Frame (est) -4,000 1b 



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